Roughness Coefficient of a Highly Calcinated Penstock
Authors : Kutay Çelebioğlu
Pages : 9309-9325
Doi:10.18400/tekderg.447265
View : 10 | Download : 14
Publication Date : 2019-07-01
Article Type : Research
Abstract :When highly calcinated water is transferred through the penstock of a hydropower plant it leaves a residue on the pipe surface. Accumulated residue over time causes a change in the roughness of the pipe surface thus friction losses in the system. The effect is a change in head and discharge relation for the turbines. A multimethodology is proposed for determining the apparent surface roughness value (ε) by means of friction factor f and measuring arithmetic mean deviation of the roughness profile (Ra), root mean square roughness (Rq) and peak and valley roughness (Rz). It is found that a surface roughness value (ε) of 0.3mm can be used for calcinated surfaces which is much higher than steel surfaces but smaller than concrete.Keywords : Friction factor, Surface roughness, Calcination